Tamari was eight years old when the priest looked into her futures and saw nothing, and by every precedent in Avalon's rolls that should have been the end of her. The null Declaration is the verdict the Temptari fear above any other. A child with no readable future is held to be a child the world has already finished with, and the families of such children do not raise them. They mourn them early and let them go. There is no record in Avalon of a null-Declared child reaching adulthood.
Tamari is the exception, and she does not know it. The priest who performed her ceremony, Doremin, told her family she had been declared to a modest and ordinary path, and handed them a sealed Declaration that said so. Her parents believe she scraped through with an unremarkable future. They do not know it was forged, only that their daughter lived when the whispers said she should not have, and they have kept her close and out of the way ever since, in the manner of people who have been given something they were not supposed to keep.
So she lives a quiet, hemmed-in life on the edge of her district, declared to nothing that matters, watched more closely than she understands. What she does not know is large. She does not know her Declaration is false. She does not know that the priest saw her real future and chose to hide it from everyone, including her. She does not know that the Grand Imperial Ecclesiarch's own sight failed where Doremin's did not, that this failure is a crack in the foundation of the entire theocracy, and that she is the crack. Maurolin knows she is alive. He watches her without acting, because every future in which he removes her is a future in which the secret of his imperfect sight breaks open.
What Tamari herself will become is the one thing in Avalon that the Ecclesiarch cannot see and the one priest who can will not say. She is a child the system declared impossible, walking around in the middle of a nation that governs by knowing exactly what every person is for. Nobody has decided yet what that means, least of all her.